tree-wide: drop dirent.h when dirent-util.h is included

src/shared/clean-ipc.c

@@ -1,6 +1,5 @@
 /* SPDX-License-Identifier: LGPL-2.1+ */
 
-#include <dirent.h>
 #include <errno.h>
 #include <fcntl.h>
 #include <limits.h>

src/shared/install.c

@@ -1,6 +1,5 @@
 /* SPDX-License-Identifier: LGPL-2.1+ */
 
-#include <dirent.h>
 #include <errno.h>
 #include <fcntl.h>
 #include <fnmatch.h>

src/shared/machine-image.c

@@ -1,6 +1,5 @@
 /* SPDX-License-Identifier: LGPL-2.1+ */
 
-#include <dirent.h>
 #include <errno.h>
 #include <fcntl.h>
 #include <stdio.h>